Clannad (Both seasons, Season 2 Named "~After Story~")
Really fullfilling, nice, funny clean story of characters. Anime Makes REALLY good job taking the "Endings" and inserting them with main story with main girl. Really many different types of characters, where for anyone at least few are likable.
First season really has it's funny moments, but some serious moments, and in end great drama, Season 2 continues with same, great line, but having it's share of REALLY REALLY sad moments that rip tears out of even a rock like me.
Best part is that unlike many anime series, after story also nailed really good ending. a POSITIVE one to be happy about.
Only "downside" would be that it is a Drama anime, some people will not like it just because of that - if some question their manliness, it IS based on Visual Novel aimed for men, with main protagonist being man - and so on.